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PCM5141: Need to have documentation on internal miniDSP program development

Part Number: PCM5141

I am working on a PCM5141 audio DAC, that embeds a so-called "miniDSP". The datasheet describes its great capabilities, as I can load a set of istructions to the DAC registers and they get executed, performing various audio processing routines. Anyway, I could not find any documentation on how to develop programs for the miniDSP. The only option that I found in the Texas Instruments site is using PurePath Studio, which I requested downloading, but my request was rejected.
As I cannot use PurePath Studio, I would like to have documentation on how to write a PCM5141 miniDSP program by myself. Is it possible?

Best regards,